Magnetic and dielectric study of R0.5Sr0.5MnO 3 (R = Gd, Tb and Dy)

Kenji Yoshii; Yusuke Hiramitsu; Yuka Okajima; Yasuhiro Yoneda; Yasuo Nishihata; Jun'Ichiro Mizuki; Akio Nakamura; Yutaka Shimojo; Yoshinobu Ishii; Yukio Morii; Naoshi Ikeda

doi:10.1016/j.materresbull.2010.07.024

Magnetic and dielectric study of R_0.5Sr_0.5MnO ₃ (R = Gd, Tb and Dy)

Kenji Yoshii, Yusuke Hiramitsu, Yuka Okajima, Yasuhiro Yoneda, Yasuo Nishihata, Jun'Ichiro Mizuki, Akio Nakamura, Yutaka Shimojo, Yoshinobu Ishii, Yukio Morii, Naoshi Ikeda

Research output: Contribution to journal › Article

12 Citations (Scopus)

Abstract

Magnetic and dielectric properties of perovskite manganites R _0.5Sr_0.5MnO₃ (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at T_g ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R³⁺ and Sr ³⁺ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above T_g. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.

Original language	English
Pages (from-to)	1574-1580
Number of pages	7
Journal	Materials Research Bulletin
Volume	45
Issue number	11
DOIs	https://doi.org/10.1016/j.materresbull.2010.07.024
Publication status	Published - Nov 2010

Keywords

A. Oxides
C. Neutron scattering
D. Dielectric properties
D. Magnetic properties
E. EXAFS

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Yoshii, K., Hiramitsu, Y., Okajima, Y., Yoneda, Y., Nishihata, Y., Mizuki, JI., Nakamura, A., Shimojo, Y., Ishii, Y., Morii, Y., & Ikeda, N. (2010). Magnetic and dielectric study of R_0.5Sr_0.5MnO ₃ (R = Gd, Tb and Dy). Materials Research Bulletin, 45(11), 1574-1580. https://doi.org/10.1016/j.materresbull.2010.07.024

Magnetic and dielectric study of R_0.5Sr_0.5MnO ₃ (R = Gd, Tb and Dy). / Yoshii, Kenji; Hiramitsu, Yusuke; Okajima, Yuka; Yoneda, Yasuhiro; Nishihata, Yasuo; Mizuki, Jun'Ichiro; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu; Morii, Yukio; Ikeda, Naoshi.

In: Materials Research Bulletin, Vol. 45, No. 11, 11.2010, p. 1574-1580.

Research output: Contribution to journal › Article

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abstract = "Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.",

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AU - Nishihata, Yasuo

AU - Mizuki, Jun'Ichiro

AU - Nakamura, Akio

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AU - Morii, Yukio

AU - Ikeda, Naoshi

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N2 - Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.

AB - Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.

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